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You can't spoof. Not in the way most people think of it. Give up ideas of being totally invisible.

As for routing, without NAT software (special third-party stuff) or M$ Internet-Connection-Sharing stuff, you can't let other people on your LAN access the internet through your computer unless your ISP has given you multiple IP addresses (which means you pay more to them)

ANTIPOINT REPLY: What, was I factually wrong? Was the post a waste of time? Did I insult someone? You could at least leave a comment.

However...you can let people on your LAN access the Internet with a single IP if you use Hide NAT...AKA PAT (Port Address Translation). I think almost all firewalls and routers can do this..the downside; your machine will not be accessible form the Internet if you are hosting anything. Terr is right you will need to pay for an extra IP in this case

You can share your connection using a Linux distro that acts as router... there are many posts here at AO about that. Search for IPCHAINS, IPMASQ, BBIagent, fwfloppy, connection sharing.

About the downside explained by iNViCTuS, it is also possible to route traffic to a box inside your LAN, for instance to use as a webserver, with a good firewall/router product or some linux config-tweaks you can route all webtraffic to your webserver inside your LAN whenever ppl enter your public IP. However this is not a very secure option, better is to use a DMZ, (DeMilitarized Zone) in this case, so your security for your LAN is high but you have one box, outside the high secure firewall setting, which will act as a webserver, if you want to secure that box too you can use different firewall boxes or one with three NIC's (1 WAN, 2 LAN) and two subnets.

As far as spoofing goes, there are plenty of apps that will allow you to do it, the question is what will you be able to achieve???

The nature of TCP/IP communications makes spoofing another IP pretty much pointless...When you try to initiate any sort of communications between your computer (with a spoofed ip) and another, your computer will request to send information, and the other computer will send an acknowledgement to the ip you are spoofing....Since it's not actually your ip, your computer will never send any information to the remote one because it will never receive the acknowlegement...

There are anonymous procies you can use to mask your ip, but since most of them log traffic, that won't stop the federalis from kicking in your door if you do something illegal...

disguise?

Spoofing?

Hmmmm?.....I've read a lot about this spoofing thingy..but haven't tried it yet...i guess it's not that easy to spoof eh?....I wish someone could really teach me how it really work... Btw does a firewall spoof your ip? if you're under one?

If the firewall does NAT (network Adress translation) it will hide your IP, the same goes for a firewall that does a IPMASQ (IP masquerading), but remember that the IP that will show up at the otherside is your firewall/router IP, so your IP isn't really spoofed. If you use a proxy you have to use one with garanteed anonimity, like one located in former sovjet republics or at some strange islands in the pacific. You have to make sure that there's no way that they will give logs to others (like fed's).